<template>
  <div class="person">
    <h1>情况一：监视【ref】定义的【基本类型】数据</h1>
    <h2>当前求和为：{{ sum }}</h2>
    <button @click="changeSum">点我sum+1</button>
  </div>
</template>

<script lang="ts" setup name="Person">
import { ref, watch } from 'vue'
// 数据
let sum = ref(0)
// 方法
function changeSum() {
  sum.value += 1
}
//监视-情况一：监视【ref】定义的【基本类型】数据
//此处sum不需要写.value
const stopWatch = watch(sum, (newValue, oldValue) => {
  console.log('sum变化了', newValue, oldValue)
  if (newValue >= 10) {
    stopWatch()
  }
})
</script>

<style scoped>
.person {
  background-color: skyblue;
  box-shadow: 0 0 10px;
  border-radius: 10px;
  padding: 20px;
}

button {
  margin: 0 5px;
}

li {
  font-size: 20px;
}
</style>